fdesc_vnops.c revision 1.96.6.2
1 /* $NetBSD: fdesc_vnops.c,v 1.96.6.2 2007/04/13 20:56:20 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)fdesc_vnops.c 8.17 (Berkeley) 5/22/95 35 * 36 * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp # 37 */ 38 39 /* 40 * /dev/fd Filesystem 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: fdesc_vnops.c,v 1.96.6.2 2007/04/13 20:56:20 ad Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/time.h> 49 #include <sys/proc.h> 50 #include <sys/kernel.h> /* boottime */ 51 #include <sys/resourcevar.h> 52 #include <sys/socketvar.h> 53 #include <sys/filedesc.h> 54 #include <sys/vnode.h> 55 #include <sys/malloc.h> 56 #include <sys/conf.h> 57 #include <sys/file.h> 58 #include <sys/stat.h> 59 #include <sys/mount.h> 60 #include <sys/namei.h> 61 #include <sys/buf.h> 62 #include <sys/dirent.h> 63 #include <sys/tty.h> 64 #include <sys/kauth.h> 65 66 #include <miscfs/fdesc/fdesc.h> 67 #include <miscfs/genfs/genfs.h> 68 69 #define cttyvp(p) ((p)->p_lflag & PL_CONTROLT ? (p)->p_session->s_ttyvp : NULL) 70 71 #define FDL_WANT 0x01 72 #define FDL_LOCKED 0x02 73 static int fdcache_lock; 74 75 dev_t devctty; 76 77 #if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1) 78 FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2 79 #endif 80 81 #define NFDCACHE 4 82 83 #define FD_NHASH(ix) \ 84 (&fdhashtbl[(ix) & fdhash]) 85 LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl; 86 u_long fdhash; 87 88 int fdesc_lookup(void *); 89 #define fdesc_create genfs_eopnotsupp 90 #define fdesc_mknod genfs_eopnotsupp 91 int fdesc_open(void *); 92 #define fdesc_close genfs_nullop 93 #define fdesc_access genfs_nullop 94 int fdesc_getattr(void *); 95 int fdesc_setattr(void *); 96 int fdesc_read(void *); 97 int fdesc_write(void *); 98 int fdesc_ioctl(void *); 99 int fdesc_poll(void *); 100 int fdesc_kqfilter(void *); 101 #define fdesc_mmap genfs_eopnotsupp 102 #define fdesc_fcntl genfs_fcntl 103 #define fdesc_fsync genfs_nullop 104 #define fdesc_seek genfs_seek 105 #define fdesc_remove genfs_eopnotsupp 106 int fdesc_link(void *); 107 #define fdesc_rename genfs_eopnotsupp 108 #define fdesc_mkdir genfs_eopnotsupp 109 #define fdesc_rmdir genfs_eopnotsupp 110 int fdesc_symlink(void *); 111 int fdesc_readdir(void *); 112 int fdesc_readlink(void *); 113 #define fdesc_abortop genfs_abortop 114 int fdesc_inactive(void *); 115 int fdesc_reclaim(void *); 116 #define fdesc_lock genfs_lock 117 #define fdesc_unlock genfs_unlock 118 #define fdesc_bmap genfs_badop 119 #define fdesc_strategy genfs_badop 120 int fdesc_print(void *); 121 int fdesc_pathconf(void *); 122 #define fdesc_islocked genfs_islocked 123 #define fdesc_advlock genfs_einval 124 #define fdesc_bwrite genfs_eopnotsupp 125 #define fdesc_revoke genfs_revoke 126 #define fdesc_putpages genfs_null_putpages 127 128 static int fdesc_attr(int, struct vattr *, kauth_cred_t, struct lwp *); 129 130 int (**fdesc_vnodeop_p)(void *); 131 const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { 132 { &vop_default_desc, vn_default_error }, 133 { &vop_lookup_desc, fdesc_lookup }, /* lookup */ 134 { &vop_create_desc, fdesc_create }, /* create */ 135 { &vop_mknod_desc, fdesc_mknod }, /* mknod */ 136 { &vop_open_desc, fdesc_open }, /* open */ 137 { &vop_close_desc, fdesc_close }, /* close */ 138 { &vop_access_desc, fdesc_access }, /* access */ 139 { &vop_getattr_desc, fdesc_getattr }, /* getattr */ 140 { &vop_setattr_desc, fdesc_setattr }, /* setattr */ 141 { &vop_read_desc, fdesc_read }, /* read */ 142 { &vop_write_desc, fdesc_write }, /* write */ 143 { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ 144 { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ 145 { &vop_poll_desc, fdesc_poll }, /* poll */ 146 { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ 147 { &vop_revoke_desc, fdesc_revoke }, /* revoke */ 148 { &vop_mmap_desc, fdesc_mmap }, /* mmap */ 149 { &vop_fsync_desc, fdesc_fsync }, /* fsync */ 150 { &vop_seek_desc, fdesc_seek }, /* seek */ 151 { &vop_remove_desc, fdesc_remove }, /* remove */ 152 { &vop_link_desc, fdesc_link }, /* link */ 153 { &vop_rename_desc, fdesc_rename }, /* rename */ 154 { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ 155 { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ 156 { &vop_symlink_desc, fdesc_symlink }, /* symlink */ 157 { &vop_readdir_desc, fdesc_readdir }, /* readdir */ 158 { &vop_readlink_desc, fdesc_readlink }, /* readlink */ 159 { &vop_abortop_desc, fdesc_abortop }, /* abortop */ 160 { &vop_inactive_desc, fdesc_inactive }, /* inactive */ 161 { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ 162 { &vop_lock_desc, fdesc_lock }, /* lock */ 163 { &vop_unlock_desc, fdesc_unlock }, /* unlock */ 164 { &vop_bmap_desc, fdesc_bmap }, /* bmap */ 165 { &vop_strategy_desc, fdesc_strategy }, /* strategy */ 166 { &vop_print_desc, fdesc_print }, /* print */ 167 { &vop_islocked_desc, fdesc_islocked }, /* islocked */ 168 { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ 169 { &vop_advlock_desc, fdesc_advlock }, /* advlock */ 170 { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ 171 { &vop_putpages_desc, fdesc_putpages }, /* putpages */ 172 { NULL, NULL } 173 }; 174 175 const struct vnodeopv_desc fdesc_vnodeop_opv_desc = 176 { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; 177 178 extern const struct cdevsw ctty_cdevsw; 179 180 /* 181 * Initialise cache headers 182 */ 183 void 184 fdesc_init() 185 { 186 int cttymajor; 187 188 /* locate the major number */ 189 cttymajor = cdevsw_lookup_major(&ctty_cdevsw); 190 devctty = makedev(cttymajor, 0); 191 fdhashtbl = hashinit(NFDCACHE, HASH_LIST, M_CACHE, M_NOWAIT, &fdhash); 192 } 193 194 /* 195 * Free hash table. 196 */ 197 void 198 fdesc_done() 199 { 200 hashdone(fdhashtbl, M_CACHE); 201 } 202 203 /* 204 * Return a locked vnode of the correct type. 205 */ 206 int 207 fdesc_allocvp(ftype, ix, mp, vpp) 208 fdntype ftype; 209 int ix; 210 struct mount *mp; 211 struct vnode **vpp; 212 { 213 struct fdhashhead *fc; 214 struct fdescnode *fd; 215 int error = 0; 216 217 fc = FD_NHASH(ix); 218 loop: 219 for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) { 220 if (fd->fd_ix == ix && fd->fd_vnode->v_mount == mp) { 221 if (vget(fd->fd_vnode, LK_EXCLUSIVE)) 222 goto loop; 223 *vpp = fd->fd_vnode; 224 return (error); 225 } 226 } 227 228 /* 229 * otherwise lock the array while we call getnewvnode 230 * since that can block. 231 */ 232 if (fdcache_lock & FDL_LOCKED) { 233 fdcache_lock |= FDL_WANT; 234 (void) tsleep(&fdcache_lock, PINOD, "fdcache", 0); 235 goto loop; 236 } 237 fdcache_lock |= FDL_LOCKED; 238 239 error = getnewvnode(VT_FDESC, mp, fdesc_vnodeop_p, vpp); 240 if (error) 241 goto out; 242 MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK); 243 (*vpp)->v_data = fd; 244 fd->fd_vnode = *vpp; 245 fd->fd_type = ftype; 246 fd->fd_fd = -1; 247 fd->fd_link = 0; 248 fd->fd_ix = ix; 249 VOP_LOCK(*vpp, LK_EXCLUSIVE); 250 LIST_INSERT_HEAD(fc, fd, fd_hash); 251 252 out:; 253 fdcache_lock &= ~FDL_LOCKED; 254 255 if (fdcache_lock & FDL_WANT) { 256 fdcache_lock &= ~FDL_WANT; 257 wakeup(&fdcache_lock); 258 } 259 260 return (error); 261 } 262 263 /* 264 * vp is the current namei directory 265 * ndp is the name to locate in that directory... 266 */ 267 int 268 fdesc_lookup(v) 269 void *v; 270 { 271 struct vop_lookup_args /* { 272 struct vnode * a_dvp; 273 struct vnode ** a_vpp; 274 struct componentname * a_cnp; 275 } */ *ap = v; 276 struct vnode **vpp = ap->a_vpp; 277 struct vnode *dvp = ap->a_dvp; 278 struct componentname *cnp = ap->a_cnp; 279 struct lwp *l = cnp->cn_lwp; 280 const char *pname = cnp->cn_nameptr; 281 struct proc *p = l->l_proc; 282 int numfiles = p->p_fd->fd_nfiles; 283 unsigned fd = 0; 284 int error; 285 struct vnode *fvp; 286 const char *ln; 287 288 if (cnp->cn_namelen == 1 && *pname == '.') { 289 *vpp = dvp; 290 VREF(dvp); 291 return (0); 292 } 293 294 switch (VTOFDESC(dvp)->fd_type) { 295 default: 296 case Flink: 297 case Fdesc: 298 case Fctty: 299 error = ENOTDIR; 300 goto bad; 301 302 case Froot: 303 if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { 304 error = fdesc_allocvp(Fdevfd, FD_DEVFD, dvp->v_mount, &fvp); 305 if (error) 306 goto bad; 307 *vpp = fvp; 308 fvp->v_type = VDIR; 309 goto good; 310 } 311 312 if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { 313 struct vnode *ttyvp = cttyvp(p); 314 if (ttyvp == NULL) { 315 error = ENXIO; 316 goto bad; 317 } 318 error = fdesc_allocvp(Fctty, FD_CTTY, dvp->v_mount, &fvp); 319 if (error) 320 goto bad; 321 *vpp = fvp; 322 fvp->v_type = VCHR; 323 goto good; 324 } 325 326 ln = 0; 327 switch (cnp->cn_namelen) { 328 case 5: 329 if (memcmp(pname, "stdin", 5) == 0) { 330 ln = "fd/0"; 331 fd = FD_STDIN; 332 } 333 break; 334 case 6: 335 if (memcmp(pname, "stdout", 6) == 0) { 336 ln = "fd/1"; 337 fd = FD_STDOUT; 338 } else 339 if (memcmp(pname, "stderr", 6) == 0) { 340 ln = "fd/2"; 341 fd = FD_STDERR; 342 } 343 break; 344 } 345 346 if (ln) { 347 error = fdesc_allocvp(Flink, fd, dvp->v_mount, &fvp); 348 if (error) 349 goto bad; 350 /* XXXUNCONST */ 351 VTOFDESC(fvp)->fd_link = __UNCONST(ln); 352 *vpp = fvp; 353 fvp->v_type = VLNK; 354 goto good; 355 } else { 356 error = ENOENT; 357 goto bad; 358 } 359 360 /* FALL THROUGH */ 361 362 case Fdevfd: 363 if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { 364 VOP_UNLOCK(dvp, 0); 365 error = fdesc_root(dvp->v_mount, vpp); 366 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 367 if (error) 368 goto bad; 369 return (error); 370 } 371 372 fd = 0; 373 while (*pname >= '0' && *pname <= '9') { 374 fd = 10 * fd + *pname++ - '0'; 375 if (fd >= numfiles) 376 break; 377 } 378 379 if (*pname != '\0') { 380 error = ENOENT; 381 goto bad; 382 } 383 384 if (fd >= numfiles || p->p_fd->fd_ofiles[fd] == NULL || 385 FILE_IS_USABLE(p->p_fd->fd_ofiles[fd]) == 0) { 386 error = EBADF; 387 goto bad; 388 } 389 390 error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp); 391 if (error) 392 goto bad; 393 VTOFDESC(fvp)->fd_fd = fd; 394 *vpp = fvp; 395 goto good; 396 } 397 398 bad: 399 *vpp = NULL; 400 return (error); 401 402 good: 403 return (0); 404 } 405 406 int 407 fdesc_open(v) 408 void *v; 409 { 410 struct vop_open_args /* { 411 struct vnode *a_vp; 412 int a_mode; 413 kauth_cred_t a_cred; 414 struct lwp *a_l; 415 } */ *ap = v; 416 struct vnode *vp = ap->a_vp; 417 418 switch (VTOFDESC(vp)->fd_type) { 419 case Fdesc: 420 /* 421 * XXX Kludge: set dupfd to contain the value of the 422 * the file descriptor being sought for duplication. The error 423 * return ensures that the vnode for this device will be 424 * released by vn_open. Open will detect this special error and 425 * take the actions in dupfdopen. Other callers of vn_open or 426 * VOP_OPEN will simply report the error. 427 */ 428 curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ 429 return EDUPFD; 430 431 case Fctty: 432 return cdev_open(devctty, ap->a_mode, 0, ap->a_l); 433 case Froot: 434 case Fdevfd: 435 case Flink: 436 break; 437 } 438 439 return (0); 440 } 441 442 static int 443 fdesc_attr(fd, vap, cred, l) 444 int fd; 445 struct vattr *vap; 446 kauth_cred_t cred; 447 struct lwp *l; 448 { 449 struct proc *p = l->l_proc; 450 struct filedesc *fdp = p->p_fd; 451 struct file *fp; 452 struct stat stb; 453 int error; 454 455 if ((fp = fd_getfile(fdp, fd)) == NULL) 456 return (EBADF); 457 458 switch (fp->f_type) { 459 case DTYPE_VNODE: 460 FILE_USE(fp); 461 error = VOP_GETATTR((struct vnode *) fp->f_data, vap, cred, l); 462 FILE_UNUSE(fp, l); 463 if (error == 0 && vap->va_type == VDIR) { 464 /* 465 * directories can cause loops in the namespace, 466 * so turn off the 'x' bits to avoid trouble. 467 */ 468 vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); 469 } 470 break; 471 472 default: 473 FILE_USE(fp); 474 memset(&stb, 0, sizeof(stb)); 475 error = (*fp->f_ops->fo_stat)(fp, &stb, l); 476 FILE_UNUSE(fp, l); 477 if (error) 478 break; 479 480 vattr_null(vap); 481 switch(fp->f_type) { 482 case DTYPE_SOCKET: 483 vap->va_type = VSOCK; 484 break; 485 case DTYPE_PIPE: 486 vap->va_type = VFIFO; 487 break; 488 default: 489 /* use VNON perhaps? */ 490 vap->va_type = VBAD; 491 break; 492 } 493 vap->va_mode = stb.st_mode; 494 vap->va_nlink = stb.st_nlink; 495 vap->va_uid = stb.st_uid; 496 vap->va_gid = stb.st_gid; 497 vap->va_fsid = stb.st_dev; 498 vap->va_fileid = stb.st_ino; 499 vap->va_size = stb.st_size; 500 vap->va_blocksize = stb.st_blksize; 501 vap->va_atime = stb.st_atimespec; 502 vap->va_mtime = stb.st_mtimespec; 503 vap->va_ctime = stb.st_ctimespec; 504 vap->va_gen = stb.st_gen; 505 vap->va_flags = stb.st_flags; 506 vap->va_rdev = stb.st_rdev; 507 vap->va_bytes = stb.st_blocks * stb.st_blksize; 508 break; 509 } 510 511 return (error); 512 } 513 514 int 515 fdesc_getattr(v) 516 void *v; 517 { 518 struct vop_getattr_args /* { 519 struct vnode *a_vp; 520 struct vattr *a_vap; 521 kauth_cred_t a_cred; 522 struct lwp *a_l; 523 } */ *ap = v; 524 struct vnode *vp = ap->a_vp; 525 struct vattr *vap = ap->a_vap; 526 unsigned fd; 527 int error = 0; 528 529 switch (VTOFDESC(vp)->fd_type) { 530 case Froot: 531 case Fdevfd: 532 case Flink: 533 case Fctty: 534 VATTR_NULL(vap); 535 vap->va_fileid = VTOFDESC(vp)->fd_ix; 536 537 #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) 538 #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) 539 #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) 540 541 switch (VTOFDESC(vp)->fd_type) { 542 case Flink: 543 vap->va_mode = R_ALL|X_ALL; 544 vap->va_type = VLNK; 545 vap->va_rdev = 0; 546 vap->va_nlink = 1; 547 vap->va_size = strlen(VTOFDESC(vp)->fd_link); 548 break; 549 550 case Fctty: 551 vap->va_mode = R_ALL|W_ALL; 552 vap->va_type = VCHR; 553 vap->va_rdev = devctty; 554 vap->va_nlink = 1; 555 vap->va_size = 0; 556 break; 557 558 default: 559 vap->va_mode = R_ALL|X_ALL; 560 vap->va_type = VDIR; 561 vap->va_rdev = 0; 562 vap->va_nlink = 2; 563 vap->va_size = DEV_BSIZE; 564 break; 565 } 566 vap->va_uid = 0; 567 vap->va_gid = 0; 568 vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 569 vap->va_blocksize = DEV_BSIZE; 570 vap->va_atime.tv_sec = boottime.tv_sec; 571 vap->va_atime.tv_nsec = 0; 572 vap->va_mtime = vap->va_atime; 573 vap->va_ctime = vap->va_mtime; 574 vap->va_gen = 0; 575 vap->va_flags = 0; 576 vap->va_bytes = 0; 577 break; 578 579 case Fdesc: 580 fd = VTOFDESC(vp)->fd_fd; 581 error = fdesc_attr(fd, vap, ap->a_cred, ap->a_l); 582 break; 583 584 default: 585 panic("fdesc_getattr"); 586 break; 587 } 588 589 if (error == 0) 590 vp->v_type = vap->va_type; 591 592 return (error); 593 } 594 595 int 596 fdesc_setattr(v) 597 void *v; 598 { 599 struct vop_setattr_args /* { 600 struct vnode *a_vp; 601 struct vattr *a_vap; 602 kauth_cred_t a_cred; 603 struct lwp *a_l; 604 } */ *ap = v; 605 struct filedesc *fdp = ap->a_l->l_proc->p_fd; 606 struct file *fp; 607 unsigned fd; 608 609 /* 610 * Can't mess with the root vnode 611 */ 612 switch (VTOFDESC(ap->a_vp)->fd_type) { 613 case Fdesc: 614 break; 615 616 case Fctty: 617 return (0); 618 619 default: 620 return (EACCES); 621 } 622 623 fd = VTOFDESC(ap->a_vp)->fd_fd; 624 if ((fp = fd_getfile(fdp, fd)) == NULL) 625 return (EBADF); 626 627 /* 628 * XXX: Can't reasonably set the attr's on any types currently. 629 * On vnode's this will cause truncation and socket/pipes make 630 * no sense. 631 */ 632 mutex_exit(&fp->f_lock); 633 return (0); 634 } 635 636 637 struct fdesc_target { 638 ino_t ft_fileno; 639 u_char ft_type; 640 u_char ft_namlen; 641 const char *ft_name; 642 } fdesc_targets[] = { 643 #define N(s) sizeof(s)-1, s 644 { FD_DEVFD, DT_DIR, N("fd") }, 645 { FD_STDIN, DT_LNK, N("stdin") }, 646 { FD_STDOUT, DT_LNK, N("stdout") }, 647 { FD_STDERR, DT_LNK, N("stderr") }, 648 { FD_CTTY, DT_UNKNOWN, N("tty") }, 649 #undef N 650 #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) 651 }; 652 static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); 653 654 int 655 fdesc_readdir(v) 656 void *v; 657 { 658 struct vop_readdir_args /* { 659 struct vnode *a_vp; 660 struct uio *a_uio; 661 kauth_cred_t a_cred; 662 int *a_eofflag; 663 off_t **a_cookies; 664 int *a_ncookies; 665 } */ *ap = v; 666 struct uio *uio = ap->a_uio; 667 struct dirent d; 668 struct filedesc *fdp; 669 off_t i; 670 int j; 671 int error; 672 off_t *cookies = NULL; 673 int ncookies; 674 675 switch (VTOFDESC(ap->a_vp)->fd_type) { 676 case Fctty: 677 return 0; 678 679 case Fdesc: 680 return ENOTDIR; 681 682 default: 683 break; 684 } 685 686 fdp = curproc->p_fd; 687 688 if (uio->uio_resid < UIO_MX) 689 return EINVAL; 690 if (uio->uio_offset < 0) 691 return EINVAL; 692 693 error = 0; 694 i = uio->uio_offset; 695 (void)memset(&d, 0, UIO_MX); 696 d.d_reclen = UIO_MX; 697 if (ap->a_ncookies) 698 ncookies = uio->uio_resid / UIO_MX; 699 else 700 ncookies = 0; 701 702 if (VTOFDESC(ap->a_vp)->fd_type == Froot) { 703 struct fdesc_target *ft; 704 705 if (i >= nfdesc_targets) 706 return 0; 707 708 if (ap->a_ncookies) { 709 ncookies = min(ncookies, (nfdesc_targets - i)); 710 cookies = malloc(ncookies * sizeof(off_t), 711 M_TEMP, M_WAITOK); 712 *ap->a_cookies = cookies; 713 *ap->a_ncookies = ncookies; 714 } 715 716 for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && 717 i < nfdesc_targets; ft++, i++) { 718 switch (ft->ft_fileno) { 719 case FD_CTTY: 720 if (cttyvp(curproc) == NULL) 721 continue; 722 break; 723 724 case FD_STDIN: 725 case FD_STDOUT: 726 case FD_STDERR: 727 if (fdp == NULL) 728 continue; 729 if ((ft->ft_fileno - FD_STDIN) >= 730 fdp->fd_nfiles) 731 continue; 732 if (fdp->fd_ofiles[ft->ft_fileno - FD_STDIN] 733 == NULL 734 || FILE_IS_USABLE( 735 fdp->fd_ofiles[ft->ft_fileno - FD_STDIN]) 736 == 0) 737 continue; 738 break; 739 } 740 741 d.d_fileno = ft->ft_fileno; 742 d.d_namlen = ft->ft_namlen; 743 (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); 744 d.d_type = ft->ft_type; 745 746 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 747 break; 748 if (cookies) 749 *cookies++ = i + 1; 750 } 751 } else { 752 int nfdp = fdp ? fdp->fd_nfiles : 0; 753 if (ap->a_ncookies) { 754 ncookies = min(ncookies, nfdp + 2); 755 cookies = malloc(ncookies * sizeof(off_t), 756 M_TEMP, M_WAITOK); 757 *ap->a_cookies = cookies; 758 *ap->a_ncookies = ncookies; 759 } 760 for (; i - 2 < nfdp && uio->uio_resid >= UIO_MX; i++) { 761 switch (i) { 762 case 0: 763 case 1: 764 d.d_fileno = FD_ROOT; /* XXX */ 765 d.d_namlen = i + 1; 766 (void)memcpy(d.d_name, "..", d.d_namlen); 767 d.d_name[i + 1] = '\0'; 768 d.d_type = DT_DIR; 769 break; 770 771 default: 772 KASSERT(fdp != NULL); 773 j = (int)i - 2; 774 if (fdp == NULL || fdp->fd_ofiles[j] == NULL || 775 FILE_IS_USABLE(fdp->fd_ofiles[j]) == 0) 776 continue; 777 d.d_fileno = j + FD_STDIN; 778 d.d_namlen = sprintf(d.d_name, "%d", j); 779 d.d_type = DT_UNKNOWN; 780 break; 781 } 782 783 if ((error = uiomove(&d, UIO_MX, uio)) != 0) 784 break; 785 if (cookies) 786 *cookies++ = i + 1; 787 } 788 } 789 790 if (ap->a_ncookies && error) { 791 free(*ap->a_cookies, M_TEMP); 792 *ap->a_ncookies = 0; 793 *ap->a_cookies = NULL; 794 } 795 796 uio->uio_offset = i; 797 return error; 798 } 799 800 int 801 fdesc_readlink(v) 802 void *v; 803 { 804 struct vop_readlink_args /* { 805 struct vnode *a_vp; 806 struct uio *a_uio; 807 kauth_cred_t a_cred; 808 } */ *ap = v; 809 struct vnode *vp = ap->a_vp; 810 int error; 811 812 if (vp->v_type != VLNK) 813 return (EPERM); 814 815 if (VTOFDESC(vp)->fd_type == Flink) { 816 char *ln = VTOFDESC(vp)->fd_link; 817 error = uiomove(ln, strlen(ln), ap->a_uio); 818 } else { 819 error = EOPNOTSUPP; 820 } 821 822 return (error); 823 } 824 825 int 826 fdesc_read(v) 827 void *v; 828 { 829 struct vop_read_args /* { 830 struct vnode *a_vp; 831 struct uio *a_uio; 832 int a_ioflag; 833 kauth_cred_t a_cred; 834 } */ *ap = v; 835 int error = EOPNOTSUPP; 836 struct vnode *vp = ap->a_vp; 837 838 switch (VTOFDESC(vp)->fd_type) { 839 case Fctty: 840 VOP_UNLOCK(vp, 0); 841 error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); 842 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 843 break; 844 845 default: 846 error = EOPNOTSUPP; 847 break; 848 } 849 850 return (error); 851 } 852 853 int 854 fdesc_write(v) 855 void *v; 856 { 857 struct vop_write_args /* { 858 struct vnode *a_vp; 859 struct uio *a_uio; 860 int a_ioflag; 861 kauth_cred_t a_cred; 862 } */ *ap = v; 863 int error = EOPNOTSUPP; 864 struct vnode *vp = ap->a_vp; 865 866 switch (VTOFDESC(vp)->fd_type) { 867 case Fctty: 868 VOP_UNLOCK(vp, 0); 869 error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); 870 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 871 break; 872 873 default: 874 error = EOPNOTSUPP; 875 break; 876 } 877 878 return (error); 879 } 880 881 int 882 fdesc_ioctl(v) 883 void *v; 884 { 885 struct vop_ioctl_args /* { 886 struct vnode *a_vp; 887 u_long a_command; 888 void *a_data; 889 int a_fflag; 890 kauth_cred_t a_cred; 891 struct lwp *a_l; 892 } */ *ap = v; 893 int error = EOPNOTSUPP; 894 895 switch (VTOFDESC(ap->a_vp)->fd_type) { 896 case Fctty: 897 error = cdev_ioctl(devctty, ap->a_command, ap->a_data, 898 ap->a_fflag, ap->a_l); 899 break; 900 901 default: 902 error = EOPNOTSUPP; 903 break; 904 } 905 906 return (error); 907 } 908 909 int 910 fdesc_poll(v) 911 void *v; 912 { 913 struct vop_poll_args /* { 914 struct vnode *a_vp; 915 int a_events; 916 struct lwp *a_l; 917 } */ *ap = v; 918 int revents; 919 920 switch (VTOFDESC(ap->a_vp)->fd_type) { 921 case Fctty: 922 revents = cdev_poll(devctty, ap->a_events, ap->a_l); 923 break; 924 925 default: 926 revents = genfs_poll(v); 927 break; 928 } 929 930 return (revents); 931 } 932 933 int 934 fdesc_kqfilter(v) 935 void *v; 936 { 937 struct vop_kqfilter_args /* { 938 struct vnode *a_vp; 939 struct knote *a_kn; 940 } */ *ap = v; 941 int error; 942 struct proc *p; 943 struct lwp *l; 944 struct file *fp; 945 946 switch (VTOFDESC(ap->a_vp)->fd_type) { 947 case Fctty: 948 error = cdev_kqfilter(devctty, ap->a_kn); 949 break; 950 951 case Fdesc: 952 /* just invoke kqfilter for the underlying descriptor */ 953 l = curlwp; /* XXX hopefully ok to use curproc here */ 954 p = l->l_proc; 955 if ((fp = fd_getfile(p->p_fd, VTOFDESC(ap->a_vp)->fd_fd)) == NULL) 956 return (1); 957 958 FILE_USE(fp); 959 error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); 960 FILE_UNUSE(fp, l); 961 break; 962 963 default: 964 return (genfs_kqfilter(v)); 965 } 966 967 return (error); 968 } 969 970 int 971 fdesc_inactive(v) 972 void *v; 973 { 974 struct vop_inactive_args /* { 975 struct vnode *a_vp; 976 struct lwp *a_l; 977 } */ *ap = v; 978 struct vnode *vp = ap->a_vp; 979 980 /* 981 * Clear out the v_type field to avoid 982 * nasty things happening in vgone(). 983 */ 984 VOP_UNLOCK(vp, 0); 985 vp->v_type = VNON; 986 return (0); 987 } 988 989 int 990 fdesc_reclaim(v) 991 void *v; 992 { 993 struct vop_reclaim_args /* { 994 struct vnode *a_vp; 995 } */ *ap = v; 996 struct vnode *vp = ap->a_vp; 997 struct fdescnode *fd = VTOFDESC(vp); 998 999 LIST_REMOVE(fd, fd_hash); 1000 FREE(vp->v_data, M_TEMP); 1001 vp->v_data = 0; 1002 1003 return (0); 1004 } 1005 1006 /* 1007 * Return POSIX pathconf information applicable to special devices. 1008 */ 1009 int 1010 fdesc_pathconf(v) 1011 void *v; 1012 { 1013 struct vop_pathconf_args /* { 1014 struct vnode *a_vp; 1015 int a_name; 1016 register_t *a_retval; 1017 } */ *ap = v; 1018 1019 switch (ap->a_name) { 1020 case _PC_LINK_MAX: 1021 *ap->a_retval = LINK_MAX; 1022 return (0); 1023 case _PC_MAX_CANON: 1024 *ap->a_retval = MAX_CANON; 1025 return (0); 1026 case _PC_MAX_INPUT: 1027 *ap->a_retval = MAX_INPUT; 1028 return (0); 1029 case _PC_PIPE_BUF: 1030 *ap->a_retval = PIPE_BUF; 1031 return (0); 1032 case _PC_CHOWN_RESTRICTED: 1033 *ap->a_retval = 1; 1034 return (0); 1035 case _PC_VDISABLE: 1036 *ap->a_retval = _POSIX_VDISABLE; 1037 return (0); 1038 case _PC_SYNC_IO: 1039 *ap->a_retval = 1; 1040 return (0); 1041 default: 1042 return (EINVAL); 1043 } 1044 /* NOTREACHED */ 1045 } 1046 1047 /* 1048 * Print out the contents of a /dev/fd vnode. 1049 */ 1050 /* ARGSUSED */ 1051 int 1052 fdesc_print(void *v) 1053 { 1054 printf("tag VT_NON, fdesc vnode\n"); 1055 return (0); 1056 } 1057 1058 int 1059 fdesc_link(v) 1060 void *v; 1061 { 1062 struct vop_link_args /* { 1063 struct vnode *a_dvp; 1064 struct vnode *a_vp; 1065 struct componentname *a_cnp; 1066 } */ *ap = v; 1067 1068 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1069 vput(ap->a_dvp); 1070 return (EROFS); 1071 } 1072 1073 int 1074 fdesc_symlink(v) 1075 void *v; 1076 { 1077 struct vop_symlink_args /* { 1078 struct vnode *a_dvp; 1079 struct vnode **a_vpp; 1080 struct componentname *a_cnp; 1081 struct vattr *a_vap; 1082 char *a_target; 1083 } */ *ap = v; 1084 1085 VOP_ABORTOP(ap->a_dvp, ap->a_cnp); 1086 vput(ap->a_dvp); 1087 return (EROFS); 1088 } 1089
Indexes created Wed Oct 22 13:09:56 GMT 2025